A systematic study of the two-dimensional electron gas at La AlO_3/SrTiO_3（110） interface reveals an anisotropy along two specific directions, [001] and 1ī0. The anisotropy becomes distinct for the interface prepar...A systematic study of the two-dimensional electron gas at La AlO_3/SrTiO_3（110） interface reveals an anisotropy along two specific directions, [001] and 1ī0. The anisotropy becomes distinct for the interface prepared under high oxygen pressure with low carrier density. Angular dependence of magnetoresistance shows that the electron confinement is stronger along the 1ī0 direction. Gate-tunable magnetoresistance reveals a clear in-plane anisotropy of the spin–orbit coupling,and the spin relaxation mechanism along both directions belongs to D＇yakonov–Perel＇（DP） scenario. Moreover, in-plane anisotropic superconductivity is observed for the sample with high carrier density, the superconducting transition temperature is lower but the upper critical field is higher along the 1ī0 direction. This in-plane anisotropy could be ascribed to the anisotropic band structure along the two crystallographic directions.展开更多
基金Project supported by the Ministry of Science and Technology of China(Grant Nos.2013CB921701,2013CBA01603,and 2014CB920903)the National Natural Science Foundation of China(Grant Nos.10974019,51172029,91121012,11422430,11374035,11474022,and 11474024)+1 种基金the Program for New Century Excellent Talents in the University of the Ministry of Education of China(Grant No.NCET-13-0054)the Beijing Higher Education Young Elite Teacher Project,China(Grant No.YETP0238)
文摘A systematic study of the two-dimensional electron gas at La AlO_3/SrTiO_3（110） interface reveals an anisotropy along two specific directions, [001] and 1ī0. The anisotropy becomes distinct for the interface prepared under high oxygen pressure with low carrier density. Angular dependence of magnetoresistance shows that the electron confinement is stronger along the 1ī0 direction. Gate-tunable magnetoresistance reveals a clear in-plane anisotropy of the spin–orbit coupling,and the spin relaxation mechanism along both directions belongs to D＇yakonov–Perel＇（DP） scenario. Moreover, in-plane anisotropic superconductivity is observed for the sample with high carrier density, the superconducting transition temperature is lower but the upper critical field is higher along the 1ī0 direction. This in-plane anisotropy could be ascribed to the anisotropic band structure along the two crystallographic directions.
基金supported by the National Natural Science Foundation of China(12104007,12004366,12004367,51627901,12074212,and U19A2093)Tsinghua University-Zhejiang Deqing Joint Research Center for Materials Design and Industrial Innovation,Innovation Program for Quantum Science and Technology(2021ZD0302802)National Key R&D Program of the MOST of China(2022YFA1602603)。
基金supported by the National Natural Science Foundation of China(11725418,21975140)Ministry of Science and Technology of China(2016YFA0301004,2016YFA0301001 and2015CB921001)+1 种基金the Basic Science Center Program of NSFC(51788104)Beijing Advanced Innovation Center for Future Chip(ICFC).
